climbing device by Vitaly Abalakov Electric rocket motor by Valentin Glushko 1930s Modern ship hull design Vladimir Yourkevitch invented the modern ship hull design when he designed the SS Normandie. 1930 Blood bank 1930 Single lift-rotor helicopter Designed by Boris N. Yuriev and Alexei M. Cheremukhin of TsAGI, the TsAGI 1-EA was flown by Cheremukhin to an unofficial altitude record of 605 meters (1,985 ft) in August 1932. 1930 Paratrooping Russian Airborne Troops - the first and largest in the world 1931 Pressure suit by Yevgeny Chertovsky 1931 Hypergolic rocket propellants by Valentyn Glushko 1931 Rhythmicon / Drum machine by Léon Theremin, the first drum machine 1931 Flame tank KhT-26 1932 Postconstructivism A transitional architectural style that existed in the Soviet Union in the 1930s, typical of early Stalinist architecture before World War II. 1932 Postal code Modern postal codes were first introduced in the Ukrainian Soviet Socialist Republic in December 1932, but the system was abandoned in 1939. 1932 Children's railway 1932 Terpsitone by Léon Theremin 1932 Underwater welding by Konstantin Khrenov 1933 Human kidney transplant In 1933 surgeon Yuriy Vorony from Kherson in Ukraine attempted the first human kidney transplant, using a kidney removed six hours earlier from a deceased donor to be reimplanted into the thigh. He measured kidney function using a connection between the kidney and the skin. His first patient died two days later, as the graft was incompatible with the recipient's blood group and was rejected. It was not until 17 June 1950, when a successful transplant was performed on Ruth Tucker, a 44-year-old woman with polycystic kidney disease, by Dr. Richard Lawler at Little Company of Mary Hospital in Evergreen Park, Illinois. 1933 Sampling theorem By Vladimir Kotelnikov 1933 Tandem rotor helicopter By Nikolay Florin 1933 Stalinist architecture Also referred to as Stalinist Gothic, or Socialist Classicism, is a term given to architecture of the Soviet Union under the leadership of Joseph Stalin. 1934 Tupolev ANT-20 Purpose-designed propaganda aircraft, the largest aircraft in 1930s 1934 Cherenkov detector Cherenkov radiation was discovered in 1934 by Pavel Cherenkov 1935 Kirza Kirza is a type of artificial leather based on the multi-layer textile fabric, modified by membrane-like substances, produced mainly in the Soviet Union and Russia as a cheap and effective replacement for natural leather. The surface of kirza imitates pig leather. The material is mainly used in production of military boots and belts for machinery